| COUNTERBORE DIAMETER | 0.384 INCHES MINIMUM AND 0.394 INCHES MAXIMUM NUT |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM |
| OVERALL HEIGHT | 0.650 INCHES MINIMUM AND 0.665 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 8740 OVERALL |
| NOMINAL THREAD SIZE | 0.375 INCHES |
| NUT COUNTERBORE DEPTH | 0.197 INCHES MINIMUM AND 0.217 INCHES MAXIMUM NUT |
| NUT STYLE | DOUBLE HEXAGON |
| WASHER OUTSIDE DIAMETER | 0.564 INCHES MINIMUM AND 0.579 INCHES MAXIMUM |
| WASHER THICKNESS | 0.289 INCHES MINIMUM AND 0.299 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| TEMP RATING | 450.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES | UNIFIED NATIONAL JOINT FINE (UNJF) |